add documentation for from-tsv, from-xml

docs/commands/from-tsv.md

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+# from-tsv
+
+Parse text as `.tsv` and create table.
+
+Syntax: `from-tsv {flags}`
+
+### Flags:
+
+    --headerless
+      don't treat the first row as column names
+
+## Examples
+
+Let's say we have the following file which is formatted like a `tsv` file:
+
+```shell
+> open elements.txt
+Symbol        Element
+H        Hydrogen
+He        Helium
+Li        Lithium
+Be        Beryllium
+```
+
+If we pass the output of the `open` command to `from-tsv` we get a correct formatted table:
+
+```shell
+> open elements.txt | from-tsv
+━━━┯━━━━━━━━┯━━━━━━━━━━━
+ # │ Symbol │ Element
+───┼────────┼───────────
+ 0 │ H      │ Hydrogen
+ 1 │ He     │ Helium
+ 2 │ Li     │ Lithium
+ 3 │ Be     │ Beryllium
+━━━┷━━━━━━━━┷━━━━━━━━━━━
+```
+
+Using the `--headerless` flag has the following output:
+
+```shell
+> open elements.txt | from-tsv --headerless
+━━━━┯━━━━━━━━━┯━━━━━━━━━━━
+ #  │ Column1 │ Column2
+────┼─────────┼───────────
+  0 │ Symbol  │ Element
+  1 │ H       │ Hydrogen
+  2 │ He      │ Helium
+  3 │ Li      │ Lithium
+  4 │ Be      │ Beryllium
+━━━━┷━━━━━━━━━┷━━━━━━━━━━━
+```

docs/commands/from-xml.md

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+# from-xml
+
+Parse text as `.xml` and create table. Use this when nushell cannot dertermine the input file extension.
+
+Syntax: `from-xml`
+
+## Examples
+
+Let's say we've got a file in `xml` format but the file extension is different so Nu can't auto-format it:
+
+```shell
+> open world.txt
+<?xml version="1.0" encoding="utf-8"?>
+<world>
+    <continent>Africa</continent>
+    <continent>Antarctica</continent>
+    <continent>Asia</continent>
+    <continent>Australia</continent>
+    <continent>Europe</continent>
+    <continent>North America</continent>
+    <continent>South America</continent>
+</world>
+```
+
+We can use `from-xml` to read the input like a `xml` file:
+
+```shell
+> open world.txt | from-xml
+━━━━━━━━━━━━━━━━
+ world
+────────────────
+ [table 7 rows]
+━━━━━━━━━━━━━━━━
+```